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Sumukha asked on

SSDs slow on some occasions


quite a speed boost happened when I switched to SSDs (have OS and data separate).

What puzzles me is that on some occasions when I open Win Explorer, the response is sluggish, WE is not responding for about six seconds.

It reminds me of a regular HDD that has gone to sleep. Not sure if that is relevant for SSDs, but on my machine the power options for HDDs say 60min for going to sleep.

I have this on both machines with SSDs, a Win 7 and a Win 8 machine. AHCI enabled.

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8/22/2022 - Mon
Scott C

Are your data drive traditional spindle ones?  If so I'd say they they are asleep and when you access Explorer it is taking a few seconds for them to spin back up.

All drives are SSDs.

Even with backup drives (spin drives) disabled, the response is sluggish.
This is occurring on two machines (Win 8 and 7) with a OCZ, a Samsung 830, and a SanDisk.
Windows search (indexer) is running, on opening e.g. the c: drive, I see the 'loading' bar crawling to the right within about 5-6 sec.
Even clicking on My Computer shows the same effect.
All drives are about half to two thirds full.
Caching enabled.
AHCI enabled.
Your help has saved me hundreds of hours of internet surfing.

Just because a system is slow doesn't mean the problem is disk I/O.   Look at the windows event logs and see if it reports anything unusual when this happens.  Maybe a system resource is just busy or there is a network timeout causing the hang.

(Networking problems are typical reason, so try this by booting machine with network cable unplugged and see if you can reproduce the problem)

Hi dlethe,
thanks for giving attention to my question.
Nothing happening in the event viewer. The system is not slow at all.
Just this delay when accessing a hard drive.

Same issue on two machines, Win 7 and 8.

A 5-6 second hang is strong indication of hardware problems (if networking timeouts are eliminated), specifically error recovery due to unreadable blocks.   I would run the manufacturers diagnostics on the SSD, and make sure that it is running latest firmware (and drivers).

The less probable but still reasonably possible things are bad ram that has to get remapped, and insufficient swap settings.
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what SSD is it?

Hi Nobus,

Machine A: Win 7, Samsung 830 on C:, SanDisk SSDX240 on E:
Machine B: Win 8, OCZ Vertex 4 partitioned C: and E:

Ran the Samsung software - all aspects great.
Running Machine B tomorrow.

Will revisit the network issue though. (Tell me - why would being connected affect showing the content of the C: drive?).


You have a point with disconnecting from network.
At least Machine A loads local drives like a snap.

Strange: 5-10 minutes after reconnecting to the internet/network, it gets sluggish again.

What does this tell us?
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William Peck

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Trouble is I don't have mounted network drives.
Only other machines on the network plus a Seagate NAS.

Then there is the MiMedia cloud drive and a Mozy Backup.

Look for UNC paths, \\server\share\... . They cause the same behaviour.

Just noticed that MIMedia actually had created a M: drive.
Uninstalled it. Things look better now.

Let me watch for a while.
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Great catch!